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<div class="moz-cite-prefix">While I'm not fully versed on the
vulnerability or the proposed fixes, my understanding is that most
of the performance impact from the fix is around having kernel
memory completely separately from a process's user-space, which
means every system call will have cache/TLB misses. This might
mean clusters which are using RDMA won't have as big of a
performance hit versus ones that aren't able to use RDMA, since
they can do a lot more in user-space without involving the kernel.<br>
<br>
On 01/04/2018 09:57 AM, Buterbaugh, Kevin L wrote:<br>
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cite="mid:5D655862-7F60-47F6-8BD2-A5298F73F70F@vanderbilt.edu">
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Happy New Year everyone,
<div class=""><br class="">
</div>
<div class="">I’m sure that everyone is aware of Meltdown and
Spectre by now … we, like many other institutions, will be
patching for it at the earliest possible opportunity.</div>
<div class=""><br class="">
</div>
<div class="">Our understanding is that the most serious of the
negative performance impacts of these patches will be for things
like I/O (disk / network) … given that, we are curious if IBM
has any plans for a GPFS update that could help mitigate those
impacts? Or is there simply nothing that can be done?</div>
<div class=""><br class="">
</div>
<div class="">If there is a GPFS update planned for this we’d be
interested in knowing so that we could coordinate the kernel and
GPFS upgrades on our cluster.</div>
<div class=""><br class="">
</div>
<div class="">Thanks…</div>
<div class=""><br class="">
</div>
<div class="">Kevin</div>
<div class=""><br class="">
</div>
<div class="">P.S. The “Happy New Year” wasn’t intended as
sarcasm … I hope it is a good year for everyone despite how it’s
starting out. :-O</div>
<div class=""><br class="">
<div class="">
<div class="">—</div>
<div class="">Kevin Buterbaugh - Senior System Administrator</div>
<div class="">Vanderbilt University - Advanced Computing
Center for Research and Education</div>
<div class=""><a href="mailto:Kevin.Buterbaugh@vanderbilt.edu"
class="" moz-do-not-send="true">Kevin.Buterbaugh@vanderbilt.edu</a> -
(615)875-9633</div>
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<pre class="moz-signature" cols="72">--
-- Skylar Thompson (<a class="moz-txt-link-abbreviated" href="mailto:skylar2@u.washington.edu">skylar2@u.washington.edu</a>)
-- Genome Sciences Department, System Administrator
-- Foege Building S046, (206)-685-7354</pre>
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